[AMDGPU] Add FP_CLASS to the add/setcc combine

This is one of the nodes which also compile as v_cmp_*.

Differential Revision: https://reviews.llvm.org/D34485

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@305970 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed